<html>
  <head>
    <title>A canvas globalCompositeOperation example</title>
    <meta name="DC.creator" content="Kamiel Martinet, http://www.martinet.nl/">
    <meta name="DC.publisher" content="Mozilla Developer Center, http://developer.mozilla.org">
    <script type="application/x-javascript">
      var compositeTypes = [
        'source-over','source-in','source-out','source-atop',
        'destination-over','destination-in','destination-out','destination-atop',
        'lighter','copy','xor'
      ];
      function draw(){
        for (i=0;i<compositeTypes.length;i++){
          var label = document.createTextNode(compositeTypes[i]);
          document.getElementById('lab'+i).appendChild(label);
          var ctx = document.getElementById('tut'+i).getContext('2d');

          // draw rectangle
          ctx.fillStyle = "#09f";
          ctx.fillRect(15,15,70,70);

          // set composite property
          ctx.globalCompositeOperation = compositeTypes[i];
          
          // draw circle
          ctx.fillStyle = "#f30";
          ctx.beginPath();
          ctx.arc(75,75,35,0,Math.PI*2,true);
          ctx.fill();
        }
      }
    </script>
    <style type="text/css">
      body { margin: 20px; font-family: arial,verdana,helvetica; background: #fff;}
      h1 { font-size: 140%; font-weight:normal; color: #036; border-bottom: 1px solid #ccc; }
      canvas { border: 2px solid #000; margin-bottom: 5px; }
      td { padding: 7px; }
      pre { float:left; display:block; background: rgb(238,238,238); border: 1px dashed #666; padding: 15px 20px; margin: 0 0 10px 0; }
    </style>
  </head>
  <body onload="draw();">
    <div>
      <table>
        <tr>
          <td><canvas id="tut0" width="125" height="125"></canvas><br/><label id="lab0"></label></td>
          <td><canvas id="tut1" width="125" height="125"></canvas><br/><label id="lab1"></label></td>
          <td><canvas id="tut2" width="125" height="125"></canvas><br/><label id="lab2"></label></td>
          <td><canvas id="tut3" width="125" height="125"></canvas><br/><label id="lab3"></label></td>
        </tr>
        <tr>
          <td><canvas id="tut4" width="125" height="125"></canvas><br/><label id="lab4"></label></td>
          <td><canvas id="tut5" width="125" height="125"></canvas><br/><label id="lab5"></label></td>
          <td><canvas id="tut6" width="125" height="125"></canvas><br/><label id="lab6"></label></td>
          <td><canvas id="tut7" width="125" height="125"></canvas><br/><label id="lab7"></label></td>
        </tr>
        <tr>
          <td><canvas id="tut8" width="125" height="125"></canvas><br/><label id="lab8"></label></td>
          <td><canvas id="tut9" width="125" height="125"></canvas><br/><label id="lab9"></label></td>
          <td><canvas id="tut10" width="125" height="125"></canvas><br/><label id="lab10"></label></td>
        </tr>
      </table>
    </div>
  </body>
</html>
